Combined straight-edge and gage



(No Model.

M. OOV'EL.

COMBINED STRAIGHT EDGE AND GAGE. No, 317,517. Patented May 12, 1885.

N. PETERS, Phnwuxho n hur. Wnhinglnn. D. C.

UNITED STATES PATENT OFFICE.

MILO GOVEL, OF CHICAGO, ILLINOIS.

COMBINED STRAIGHT-EDGE AND GAGE.

SPECIFICATION forming part of Letters Patent No. 317,517, dated May 12, 1885.

Application filed July 15, 1884. (No model.) i

To aZZ whom it may concern.-

Be it known that I, MILO OovnL, of Ohicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in a Combined Straight-Edge and Gage, of which the following is a full, clear, and exact description that will enable others to make and use the same, reference being had to the accompanying drawings, forming a partof this specification.

The object of this invention is to provide a device of this nature for truing and straightening flat surfaces, but is more particularly intended for use in the operation of dressing circular saws.

The nature of this invention consists in attaehing to a straight-edge an adjustable gageplate, adapted to be moved at right angles to the same for the purpose of accurately ascertaining the different degrees of unevenness in saw-plates.

Figure 1 is a front elevation of a straightedge embodying my improved features; Fig. 2, a transverse section in the plane 2 2, Fig. 1 Fig. 3,'a central section in the plane 3 3, Fig. 1; and Fig. 4, a longitudinal section in the plane at 4, Fig. 1.

Referring to the drawings, A represents a straight-edge plate, which is ordinarily'composed of metal, and B an adjustable gageplate placed at right angles to the longitudinal plane of the straight-edge. The gage-plate B is adj ustably secured in relation to the straight-edge by means of the thumb-screw O,

the threaded end of which terminates in the straight-edge. This thumb-screw is provided with the washer a, interposed between the shoulder a of the thumb-screw and the face of the gage-plate, and passes through the elongated aperture or slot D in said gage. By this arrangement the gage-plate may be caused to slide up or down, as required, and securely and conveniently clamped in any position to which it may be adjusted.

The dotted lines in Fig. 1, running from one end to the other of the straightedge, repre sent the surface of a circular-saw plate, while the two short dotted lines indicate the position of the gage-plate when brought into contact with the saw-plate. The lower end of the gage In dressing saws it is a very difiicult. matter to bring the saw-plate to the desired point by means of the ordinary straight-edge. Take, for instance, a saw the diameter of which is six feet, the operator in moving the ordinary straight'edge over the same must be entirely governed by the eye. Now, my improved feature entirely overcomes this objection and leaves nothing to be guessed at, for the exact degree of concavity or convexity at different points on the surface of the saw-plate may be accurately known and the saw operated upon in accordance with the different rates of speed to which it is to be subjected. By this arrangement it may be accurately ascertained just how much to open the saw and the precise amount of sag there may be in the plate, which it has not been possible to do with the ordinary straight-edge.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

The combinatiomwith a straight-ed ge, of the adjustable gageplate B, provided with the elongated slot D, the thumb-screw O, and the gage-points d d, constructed and arranged to operate as and for the purpose set forth.

MILO COVEL. Witnesses:

L. M. FREEMAN, L. B. COUPLAND. 

